Microwave oven



FIG. 1 is a front, top and right side perspective view of _a microwaveoven showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof; and

FIG. 4 is a rear, bottom and left side perspective view _thereof.

The ornamental design for a microwave oven, as shown.